If you're gathering up quite a bit of gear and looking to upgrade your camera bag, check out the Tamrac 5788 Evolution 8 series. The bag can be worn either as a backpack or a sling on either shoulder. Access to the main compartment can be accessed from each side or from the back. Tons of space to fit even a laptop, and a section designed to hold a DSLR body with up to an 8" lens attached. There's a QuickClip Tripod strap to keep a travel tripod secure, and plenty of padding on the outside as well as the inside. Prices for the Tamrac 5788 Evolution 8 can be found here.